sawyer



(No Modeli) 2 Sheets-Sheet 1.

W. H. .SAWYEEL Electric Annunoiator.

No. 242,055. Patentedmay 24,1881i .lll

lilla' (No Model.) Y 2 Sheets-Sheet, 2. W. H. SAWYER.

Electric Annunoiator.

No. 242,055. Patented May 24,1881.

' UNITED' STATES;

PATENT OFFICEO WILLIAM H. SAVYER, OF PROVIDENCE, RHODE ISLAND, ASSIGN OR OF ONE-HALF TO EUGENE F. PHILLIPS, OF SAME PLACE.

ELECTRIC ANNUNCIATOR.

SPECIFICATION forming part of Letters Patent No. 242,055, dated May 24, 1881. Application led January 17, 1881. (No model.)

To all lwhom Ait may concern:

Be it known that I, WILLIAM H. SAWYER, a citizen of the United States, residing' at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Electric Annunciators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompan yin g drawings, and to letters or gures of reference marked thereon,which form a part of this specification.

This invention relates to that class of electric annunciators in which a drop held up by suitable devices isv tripped through the'instrumentality of an electromagnet and allowed to fall by gravity. Its objects are to prevent the drop from being thrown down by jarring, cnrrents of air, rebounding, or otherwise unintentionally, while at the same time rendering it readily responsive to its operating electromagnet, and to render an aununciator capable J of being readily adapted to use with either a closed or open circuit.

In the accompanying drawings, Figure lis a front view of a single drop, armature, and magnet face-plate in an annunciator constructed according to my invention on the open-circuit plan, the drop being up. Fig. 2 is asimilar view with the drop down. Fig. 3 is a view, mainly in section, in a plane coincident with the vertical diameter of the operating electromagnet.

The annunciator constructed as in the iigures above described is especially designed for use in connection with magneto-electric generators, such as are employed in telephone callsystems. l

Fig. 4 is a partially-sectional view, illustrating the apparatus organized for use with a closed circuit. Fig. 5 is a partially-sectional view of a modiied form ot' a closed-circuit annunciator.

Referring first to Fig. 3, the letter A indicates an electro-magnet, the front head-piece, A', of the coil of which has a greater diameter than the coil and the circular aperture in the 5o face-board B, in which the magnet is arranged,

and serves as a face-plate for attachment to the front of said board, to hold the magnet and its co-operative devices in position, the margin ot' said face-plate extending outward beyond the edge of the aperture, as shown in Fig. 4, and having the attaching-screws passed through it and into the board.

Above the magnet, in Figs. 1, 2, and 3, a bit'nrcated lug, O, is screwed into the face-plate A', and has pivoted to its arms, at their outer sides, the ears d of an armature, D, and by the same pivot-pins are held the ears e of a drop, E, which has upon its back surface a suitable number, letter, or other sign. From said back surface also projects an iron or steel lug, e', which, when the drop is raised, as shown in Figs. l and 3, rests upon the head of a magnetized pin, F, whichis driven into the board B, the magnetic attraction of this pin serving to hold the drop against being thrown down by jarring, currents of air, or rebound when thrown up.

From the upper edge of the armature B a pin, G, having an eccentric head, extends upward behind the drop E in its elevated position, and when an electric current is passed through the helix of magnetA the armature is attracted by the core a, the head of the pin Gr strikes the drop, forcing it loose from the hold of the magnetic pin F, and outward beyond its center of gravity, so that said drop falls to the position inwhich it is shown in Fig. 2, exposing its indicating-face.

In order to utilize both poles of the electromagnet, I connect the rear end of the core a by means of a metal yokepiece with a rod, C', which has its front end tapped into the screwshank ot' the bifurcated lug G.

When the drop of an annunciator falls it is desirable that a signal should be sounded, and this is usually accomplished by closing a local circuit including an electric bell. I have provided for closing such a signal-circuit by inserting in the armature D ametal screw, D', which passes through it and projects from its rear face sufficiently to come in contact with the head of a metal screw, d', inserted in the face-plate A' when the armature is attracted, thus making a metallic contact which closes the local or signal circuit. I connect with this IOO screw d' the end of a wire, b, which forms one terminal of the signal-circuit, the other terminal, b', ot' which I connect to the rod C', which brings it into electric connection with the armature through the lug C. Whenever the armature is attracted by the core a, and screw D' strikes d', the local or signal circuit will, of course, be closed, and a suitable bell may be thus sounded.

The magnet A is to be connected with a main circuit and circuit-closingdevices in the usual manner.

The apparatus as now described is, as is obvious, arranged for use in an open circuit, and I will now proceed, referring to Fig. 4, to dcscribe how it may be arranged for use in a closed circuit.

In t-hetirst place the drop E is to be removed, a suitable inscription having been placed upon the back of the armature. The position of the face-plate A' is then reversed, turning the magnet and bringing the lug C below instead ot' above the core a. The screw D' is removed from the armature and screwed into a hole which will be noticed in the front end of the core in Fig. 3. The curved pin G is removed from the edge ot" the armature, its screw end passed through the hole left open in the armature by the removal of screw D', and screwed into an oblique screw-hole or countersink, which will be noticed in the screw d' in Fig. 1, the pin being left curving downward, as shown in Fig. 4. The magnetic pin F may be removed, as it is of no use in this arrangement. Iwo parts only, it will be observed, are discarded in arranging the annunciator for a closed circuit, and no new parts are required. As the parts are now arranged in Fig. 4, if the main circuit, which includes the magnet A, is broken, the armature D, being held outward beyond its center of gravity by the pin D', will swing downward until it strikes the head of pin G, which stops it in the position shown in dotted lines, in which position its indicating-face is exposed, and at the same time the head ofthe pin forms an electric contact, which closes the local or signal circuit over the piu, armature, lug C, rod C', screw d', and wires b and b'. The magnet A is in this arrangement included in a main circuit havY ing suitable circuit-breakers.

1n the. modification shown in Fig. 5, which is also adapted for use in a closed circuit, the drop E' is used and provided with a projecting pin, E", which comes in contact with the core of an electro-magnet, A", when the drop falls, and thus closes a signal-circuit, over said core and a wire, b2, connected to its rear end, and over the drop, which is metallic, the lug C2, to which it is pivoted, and a wire, b3. The armature D2 is arranged facing the rear end of the core of the magnet A", and is carried by a bent lever, H, which is retracted by a spring, I, and has its outward movement limited by a stop-pin, h, projecting from the face-board B. The outer end portion of the lever H is secured to a short arm, K, which is pivoted to the lug U2, and the tip ot' said lever stands very close to, and may even touch, the drop when the latter is raised and the circuit is closed. lThe moment the circuit is broken the armature D2 is released by the core of the magnet, the lever H is drawn upward by the spring l, and its tip thrown forward, forcing the drop away from the magnet F and outward beyond its ceuterot' gravity, when it falls to the position shown in dotted lines, exposing its indicating-face and bringing the pin E" in contact with the core of the magnet to close the signal-circuit, as before described.

Having now fully described my invention, and fully explained the operation thereof, l claiml. An open-circuit electric annunciator in which an indicating-drop is held inits upright position by a permanent magnet, substantially as described, whereby is obviated the throwing down ot' the drop by jarring, currents of air, rebounding, or other unintentional agencies.

2. The combination, with the electro-magnet A, ot' the pendent armature l), provided with pin G, the pivoted drop E, and the magnetic pin F, substantially as and {'or the purpose set forth.

3. The combination, with thc electro-magnet A, ol' the pendent pivoted armature D, provided with the removable screw D', the screw or contact-piece d', having wire b connected thereto, the wire b', electrically connected with the said armature, a drop, and a suitable intermediate device for throwing down said drop when the armature is attracted by the core of the magnet, whereby the annunciator may be arranged for the closing of a signal-circuit simultaneously with the falling ot' the drop, essentially as set forth.

4. In an electric annunciator, the electromagnet A, having the screwsocket in the front end of its core, the face-plate A', adapted for reversal in position, and provided with the lug C, the screw Z',hav1ng the screw-threaded socket or countersink, and the armature D, having the removable screw D', and the removable pin G, whereby the annuuciator may be arranged for operation by either a closed or open circuit, essentially as set forth.

ln testimony whereof I adix my signature in presence ot' two witnesses.

WILLIAM H. SAWYEl-t.

Witnesses GILMAN J orr, J oHN C. PURKrs.

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